In the anti-virus policy configuration of Huawei USG6000 product, what are the response methods of HTTP protocol? (multiple choice)

The IPS function of Huawei USG6000 supports two response methods: blocking and alarming.

Anti-DDoS defense system includes: management center, detection center and cleaning center.

Regarding the sequence of file filtering technology processing flow, which of the following is correct?
(1) The security policy is applied as permit
(2) Protocol decoding
(3) File type recognition
(4) Application recognition
(5) File filtering

When the Anti DDoS system finds the attack flow, the state will redirect the attack flow to the cleaning device.
After the cleaning device is cleaned, it will flow back.
Note to the original link, which of the following options does not belong to the method of re-injection?